Hearing aid



FIG. 1 is an elevated right, front perspective view of a behind-the-ear (“BTE”) component and an elevated left, front perspective view of a receiver component of the hearing aid;

FIG. 2 is a bottom view of the hearing aid;

FIG. 3 is a front view of the BTE component and a side view of the receiver component of the hearing aid;

FIG. 4 is a top view of the BTE component and a perspective view of the receiver component of the hearing aid;

FIG. 5 is a left side view of the BTE component and a rear perspective view of the receiver component of the hearing aid;

FIG. 6 is a right side view of the BTE component and a front perspective view of the receiver component of the hearing aid; and,

FIG. 7 is a rear view of the BTE component and a perspective view of the receiver component of the hearing aid. 

The ornamental design for a hearing aid, as shown and described. 